Sir Arthur Conan Doyle 
Sherlock Holmes and the Adventure at the Copper Beeches [PDF ebook] 
Case 8

Violet Hunter takes a job as a governess at the Copper Beeches. But she is puzzled when her employers ask her to cut her hair and wear a special dress. Things get stranger still when she finds a lock of hair that looks like her own and a mysterious hallway. Violet turns to Sherlock Holmes and Dr. Watson for help, but is it already too late?